EUVD-2026-81260Severity by source
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
Span attribute content is commonly sourced from remote/user input so AV:N; only availability (memory-pressure) impact and it is marginal, hence A:L and C/I:N.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Span attribute length limits can be bypassed in the OpenTelemetry-Go SDK trace package from 1.10.0 up to (but not including) 1.33.0, allowing an attacker who controls content recorded as a span attribute to retain string values far longer than the configured AttributeValueLengthLimit and thereby inflate per-span memory use inside the instrumented process. The root cause is a Unicode handling defect: the truncation helper misclassifies the valid replacement character U+FFFD as invalid UTF-8 and returns the original oversized value, and a fallback sanitization pass also leaves it unchanged. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires that (1) the instrumented Go application uses opentelemetry-go SDK trace between 1.10.0 and 1.33.0, (2) an AttributeValueLengthLimit is actually configured (the limit being bypassed), and (3) the attacker can influence content that the application records as a string or string-slice span attribute, specifically embedding the valid Unicode replacement character U+FFFD so the truncation path returns the original oversized value. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a low-to-moderate real-world risk, best characterized as a defense-in-depth/hardening weakness rather than a directly exploitable flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade go.opentelemetry.io/otel/sdk to sdk/v1.33.0 or later (release tag https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.33.0, commit e016a78c9f5b24a1c2beeaad47686c2f2213f49a, PR https://github.com/open-telemetry/opentelemetry-go/pull/5997, advisory https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-p9f8-wvj8-2fg8), update go.mod/go.sum accordingly, and rebuild and redeploy so the new truncation logic is in effect; bumping the pseudo-version alone without rebuilding leaves the old code linked in. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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