CVE catalog
CVE-2026-81869
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 a
- Severity
- Medium · CVSS 5.1
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.18% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | golang-opentelemetry-otel | sid | 1.46.0-3 | fixed |
| Debian | golang-opentelemetry-otel | forky | 1.46.0-2 | fixed |
| Debian | golang-opentelemetry-otel | trixie | 1.31.0-4 | vulnerable |
| Debian | golang-opentelemetry-otel | bookworm | 1.1.0-2 | not affected |
| Go | go.opentelemetry.io/otel/sdk | Not reported | 1.33.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | golang-opentelemetry-otel | source | sid | 1.43.0-1 | not yet assigned | Not reported | Not reported |
| Debian | golang-opentelemetry-otel | source | forky | 1.43.0-1 | not yet assigned | Not reported | Not reported |
| Debian | golang-opentelemetry-otel | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | golang-opentelemetry-otel | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Go | go.opentelemetry.io/otel/sdk | go | Not reported | 1.33.0 | Not reported | GHSA-P9F8-WVJ8-2FG8 | Not reported |
Notes
[trixie] golang-opentelemetry-otel: Minor issue
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [golang-opentelemetry-otel-dev]Affected
Source package: [golang-opentelemetry-otel]
Details (2)
1.31.0-4· all · trixieAffected
nvd · golang-opentelemetry-otel · debian · 13
1.31.0-4· all · trixieAffected
nvd · golang-opentelemetry-otel · debian · 13
[Debian 12 (Bookworm)]
- [golang-opentelemetry-otel-dev]Not affected
Source package: [golang-opentelemetry-otel]
Details (2)
1.1.0-2· all · bookwormNot affected
nvd · golang-opentelemetry-otel · debian · bookworm
1.1.0-2· all · bookwormNot affected
nvd · golang-opentelemetry-otel · debian · bookworm
Observed:
References
- [https://github.com/advisories/GHSA-p9f8-wvj8-2fg8]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-81869]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-81869]
- [https://security-tracker.debian.org/tracker/CVE-2026-81869]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81869.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]