stdlib has 31 CVEs on record between 2022 and 2026. Disclosure cadence is accelerating: 18 in the last 90 days against 1 in the 90 before. The busiest recent month was October 2026 with 13. The median CVSS is 7.5 (high), with 2 rated critical. None have a confirmed exploitation report. The dominant weakness classes are CWE-770 (8) and CWE-405 (3).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 7.5
- Publish → KEV
- —
- Last 90 days
- 18 prev 1
Weakness classes
Products
- stdlib 31
Worst active — by depth score
CVE-2026-56857Critical· 9.8On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root54CVE-2023-39325High· 7.5HTTP/2 rapid reset can cause excessive work in net/http54CVE-2026-78663Critical· 9.1The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered da…50CVE-2026-56858High· 8.1Fix Javascript regexp context tracking in html/template45CVE-2026-97032High· 7.5HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently41
stdlib vulnerabilities
CVEs affecting stdlib, newest first. Open any entry for full detail, references, and exploit status.
31 CVEsRSS
CVE-2026-97032High· 7.5HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently
HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently. This happens because the server modifies the HPACK encoder from two goroutines without synchronization: one uses the encoder to encode a …
CVE-2026-97031High· 7.5Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references
Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject t…
CVE-2026-97030Medium· 6.1A trusted template author may have previously written a valid template wherein the use of the 'yield' keyword would not be correctly escaped
A trusted template author may have previously written a valid template wherein the use of the 'yield' keyword would not be correctly escaped. We now ensure that valid keyword uses are escaped and non-keyword uses are not escaped.
CVE-2026-94448Medium· 6.1When a JavaScript template literal contains consecutive expressions, the context tracking state was not properly reset upon entering a new expression
When a JavaScript template literal contains consecutive expressions, the context tracking state was not properly reset upon entering a new expression. We now ensure that template-literal expression entries correctly reset context variabl…
CVE-2026-94440High· 7.5Parsing a multipart form can bypass memory limits and read an arbitrarily long line into memory when the remaining limit at the start of a part is less than 400 bytes.
Parsing a multipart form can bypass memory limits and read an arbitrarily long line into memory when the remaining limit at the start of a part is less than 400 bytes.
CVE-2026-94439High· 7.5When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns without hijacking the connection, the server improperly continues to read and serve requests from the connection
When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns without hijacking the connection, the server improperly continues to read and serve requests from the connection. Since a 2xx response to an HTTP/1…
CVE-2026-78669High· 7.5A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.
A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.
CVE-2026-78667High· 7.5When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.
When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.
CVE-2026-78663Critical· 9.1⚖ disputedThe HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered da…
The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered da…
CVE-2026-78660High· 7.5Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing
Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses …
CVE-2026-78659High· 7.5When "Trailer" headers are sent by a client, the HTTP server internally uses the header values to populate the Request.Trailer map passed to the server handler
When "Trailer" headers are sent by a client, the HTTP server internally uses the header values to populate the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs memory overhead. For HTT…
CVE-2026-56866High· 7.5When http.Transport sends an HTTP/1 CONNECT request with a non-empty Request.Body, it writes the body directly to the connection without framing after the request headers
When http.Transport sends an HTTP/1 CONNECT request with a non-empty Request.Body, it writes the body directly to the connection without framing after the request headers. If the server rejects the CONNECT request with a non-2xx keep-ali…
CVE-2026-56857Critical· 9.8⚖ disputedOn Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root
On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root. This only applies to o…
CVE-2026-56860High· 7.5Avoid quadratic complexity in resolvePath in net/url
Avoid quadratic complexity in resolvePath in net/url
CVE-2026-56858High· 8.1Fix Javascript regexp context tracking in html/template
Fix Javascript regexp context tracking in html/template
CVE-2026-56862High· 7.5Limit handshake messages we are willing to accept post-handshake in crypto/tls
Limit handshake messages we are willing to accept post-handshake in crypto/tls
CVE-2026-56853High· 7.5Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http
Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http
CVE-2026-56859High· 7.5Add recursion depth guard during decode in encoding/xml
Add recursion depth guard during decode in encoding/xml
CVE-2026-42507Medium· 5.3Arbitrary inputs are included in errors without any escaping in net/textproto
Arbitrary inputs are included in errors without any escaping in net/textproto
CVE-2026-32281Medium· 5.9Inefficient policy validation in crypto/x509
Inefficient policy validation in crypto/x509
CVE-2025-68121NoneUnexpected session resumption in crypto/tls
Unexpected session resumption in crypto/tls
CVE-2025-61728NoneExcessive CPU consumption when building archive index in archive/zip
Excessive CPU consumption when building archive index in archive/zip
CVE-2025-61729NoneExcessive resource consumption when printing error string for host certificate validation in crypto/x509
Excessive resource consumption when printing error string for host certificate validation in crypto/x509
CVE-2025-58183Medium· 4.3tar.Reader does not set a maximum size on the number of sparse region data blocks in GNU tar pax 1.0 sparse files
tar.Reader does not set a maximum size on the number of sparse region data blocks in GNU tar pax 1.0 sparse files. A maliciously-crafted archive containing a large number of sparse regions can cause a Reader to read an unbounded amount o…
CVE-2025-47906Medium· 6.5Unexpected paths returned from LookPath in os/exec
Unexpected paths returned from LookPath in os/exec
CVE-2024-34158NoneStack exhaustion in Parse in go/build/constraint
Stack exhaustion in Parse in go/build/constraint
CVE-2023-39325High· 7.5PoCHTTP/2 rapid reset can cause excessive work in net/http
HTTP/2 rapid reset can cause excessive work in net/http
CVE-2022-41715NoneMemory exhaustion when compiling regular expressions in regexp/syntax
Memory exhaustion when compiling regular expressions in regexp/syntax
CVE-2022-2880NoneIncorrect sanitization of forwarded query parameters in net/http/httputil
Incorrect sanitization of forwarded query parameters in net/http/httputil
CVE-2022-2879NoneUnbounded memory consumption when reading headers in archive/tar
Unbounded memory consumption when reading headers in archive/tar