01 Record

CVE-2026-33487

goxmldsig has validateSignature Loop Variable Capture Signature Bypass

HighPUBLISHEDCNA: GitHub_M

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

View raw JSON

02 Description

goxmldsig has validateSignature Loop Variable Capture Signature Bypass

03 Exploitation and scoring

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.30% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 22.3% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-08-25.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-03-26 17:17Z5 MO AGO

Last updated

2026-08-26 12:05Z9 DAYS AGO

Reserved

2026-03-20

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weaknesses

CWE-347Improper Verification of Cryptographic SignatureBase
CWE-682Incorrect CalculationPillar

Data version

5.2

Document digest

6024bafbfdc30eaa13c62c4de377e3f121756f366550936d3c9b6a42015ad782

05 Affected products

VendorProductVersionsPlatforms

russellhaeringgoxmldsig< 1.6.0—

06 References

github.comhttps://github.com/russellhaering/goxmldsig/security/advisories/GHSA-479m-364c-43vcx_refsource_CONFIRM
access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-33487vdb-entryx_refsource_REDHAT
bugzilla.redhat.comRHBZ#2451814https://bugzilla.redhat.com/show_bug.cgi?id=2451814issue-trackingx_refsource_REDHAT
security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33487.jsonx_sadp-csaf-vex
access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:22423vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:21769vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:36882vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:13548vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:20946vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:20943vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:22347vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:23345vendor-advisoryx_refsource_REDHAT

01 Record index

CVE-2026-33487

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2026-33487

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References