CVE-2026-55984Public exploitNetwork attack vector

Authenticated service interruption via nil user dereference

Published Aug 13, 2026 · Updated Aug 13, 2026

Null pointer dereference in Gitea 1.26.4 and earlier allows remote authenticated users to interrupt service through the AddTime API. The AddTime handler reports a failed GetUserByName lookup but continues, passes a nil user to issues_model.AddTime, and triggers a runtime panic. Repository administrator access is required; repeated requests cause request failures and can degrade availability depending on panic recovery.

CVSS severity2.7
Low
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Gitea 1.26.4 and earlier allows remote authenticated users to interrupt service through the AddTime API. The AddTime handler reports a failed GetUserByName lookup but continues, passes a nil user to issues_model.AddTime, and triggers a runtime panic. Repository administrator access is required; repeated requests cause request failures and can degrade availability depending on panic recovery.

The record

CVE
CVE-2026-55984
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Gitea
Product
Gitea
Classifications
CWE-476, CWE-284, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.26.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Gitea · Giteaversion=0 <=1.26.4

Published CVSS scores

2.7Red HatCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
2.7CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
2.7GiteaCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-284Improper Access Control
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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