CVE-2026-81869Medium· 5.1▾ TwilightPoC availableOpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.10.0 until 1.33.0, the sdk/trace/span.go attribute truncation path can fail to enforce AttributeValueLengthLimit for string and string-slice attributes containing…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 28.1 · likelihood 0 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Exploit / PoC code exists
0.1%
0.1% → 0.2%
Last analysed / modified upstream
OpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.10.0 until 1.33.0, the sdk/trace/span.go attribute truncation path can fail to enforce AttributeValueLengthLimit for string and string-slice attributes containing the valid Unicode replacement character U+FFFD. safeTruncateValidUTF8 treats the valid replacement rune as invalid UTF-8 and returns the original input, while strings.ToValidUTF8 leaves that valid rune unchanged, so a second safeTruncate attempt can also return the oversized value. An attacker who controls span attribute content can retain values longer than the configured limit, increasing per-span memory use and weakening denial-of-service protection in the instrumented process. This issue is fixed in version 1.33.0.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
go.opentelemetry.io/otel/sdk >= 1.10.0, < 1.33.0Patched in:
go.opentelemetry.io/otel/sdk 1.33.0Source: https://github.com/advisories/GHSA-p9f8-wvj8-2fg8
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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