CVE-2026-52796 (GCVE-0-2026-52796)
Vulnerability from cvelistv5 – Published: 2026-06-24 20:13 – Updated: 2026-06-25 20:10
VLAI
EPSS
VEX
Title
Gogs: DoS in rendering issue index pattern
Summary
Gogs is an open source self-hosted Git service. Prior to 0.14.3, specially crafted issue index pattern can cause a panic when rendering, resulting in denial of service. In internal/markup/markup.go, RenderIssueIndexPattern renders the issue index pattern to a link using com.Expand, which is not safe: when the configured pattern contains an opening brace { but no closing brace }, strings.Index(template, "}") returns -1 and the subsequent slice template[:-1] triggers a panic. Once such a pattern is set, any page in the affected repository that contains an issue index reference such as #1 becomes unavailable. This vulnerability is fixed in 0.14.3.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 20:10 UTC
CWE
- CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/gogs/gogs/security/advisories/… | x_refsource_CONFIRM |
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FKIE_CVE-2026-52796
Vulnerability from fkie_nvd - Published: 2026-06-24 21:16 - Updated: 2026-06-25 21:16
Severity
Summary
Gogs is an open source self-hosted Git service. Prior to 0.14.3, specially crafted issue index pattern can cause a panic when rendering, resulting in denial of service. In internal/markup/markup.go, RenderIssueIndexPattern renders the issue index pattern to a link using com.Expand, which is not safe: when the configured pattern contains an opening brace { but no closing brace }, strings.Index(template, "}") returns -1 and the subsequent slice template[:-1] triggers a panic. Once such a pattern is set, any page in the affected repository that contains an issue index reference such as #1 becomes unavailable. This vulnerability is fixed in 0.14.3.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"product": "gogs",
"vendor": "gogs",
"versions": [
{
"status": "affected",
"version": "\u003c 0.14.3"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Gogs is an open source self-hosted Git service. Prior to 0.14.3, specially crafted issue index pattern can cause a panic when rendering, resulting in denial of service. In internal/markup/markup.go, RenderIssueIndexPattern renders the issue index pattern to a link using com.Expand, which is not safe: when the configured pattern contains an opening brace { but no closing brace }, strings.Index(template, \"}\") returns -1 and the subsequent slice template[:-1] triggers a panic. Once such a pattern is set, any page in the affected repository that contains an issue index reference such as #1 becomes unavailable. This vulnerability is fixed in 0.14.3."
}
],
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"lastModified": "2026-06-25T21:16:27.133",
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L",
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GHSA-4J89-2C4F-44C6
Vulnerability from github – Published: 2026-06-22 23:58 – Updated: 2026-07-21 13:17
VLAI
Summary
Gogs has DoS in rendering issue index pattern
Details
Summary
Special template of issue index pattern may cause panic.
Details
in internal/markup/markup.go
link = fmt.Sprintf(`<a href="%s">%s</a>`, com.Expand(metas["format"], metas), m)
Issue index pattern is rendered to link with com.Expand.
However, com.Expand is not safe.
i = strings.Index(template, "}")
if s, ok := match[template[:i]]; ok {
when { is found but } not found, i comes to 1, template[:-1] will be called, and then panicked
finally, all pages than contains issue index are unavailable.
PoC
- set issue index pattern as follow
- add a commit which point to an issue in its msg
using #1 above
Impact
DoS that cause part of pages of the specify repo unavailable.
Severity
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.14.2"
},
"package": {
"ecosystem": "Go",
"name": "gogs.io/gogs"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.14.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-52796"
],
"database_specific": {
"cwe_ids": [
"CWE-1336"
],
"github_reviewed": true,
"github_reviewed_at": "2026-06-22T23:58:17Z",
"nvd_published_at": "2026-06-24T21:16:55Z",
"severity": "LOW"
},
"details": "### Summary\nSpecial template of issue index pattern may cause panic.\n\n### Details\n\nin internal/markup/markup.go\n\n```go\nlink = fmt.Sprintf(`\u003ca href=\"%s\"\u003e%s\u003c/a\u003e`, com.Expand(metas[\"format\"], metas), m)\n```\n\nIssue index pattern is rendered to link with `com.Expand`.\n\nHowever, `com.Expand` is not safe.\n\n```go\ni = strings.Index(template, \"}\")\nif s, ok := match[template[:i]]; ok {\n```\n\nwhen `{` is found but `}` not found, i comes to 1, template[:-1] will be called, and then panicked\n\n\n\nfinally, all pages than contains issue index are unavailable.\n\n### PoC\n\n1. set issue index pattern as follow\n\n\n\n2. add a commit which point to an issue in its msg\n\n\n\nusing `#1` above\n\n### Impact\n\nDoS that cause part of pages of the specify repo unavailable.",
"id": "GHSA-4j89-2c4f-44c6",
"modified": "2026-07-21T13:17:05Z",
"published": "2026-06-22T23:58:17Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/gogs/gogs/security/advisories/GHSA-4j89-2c4f-44c6"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52796"
},
{
"type": "WEB",
"url": "https://github.com/gogs/gogs/pull/8312"
},
{
"type": "WEB",
"url": "https://github.com/gogs/gogs/commit/0529d95fc39f2b6d2997b19a2a12e24522684722"
},
{
"type": "PACKAGE",
"url": "https://github.com/gogs/gogs"
},
{
"type": "WEB",
"url": "https://github.com/gogs/gogs/releases/tag/v0.14.3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
}
],
"summary": "Gogs has DoS in rendering issue index pattern"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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