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SCA: security update for github.com/sigstore/rekor (GHSA-47q9-m4ww-924m)

high Tenable Self-Hosted Container Security Plugin ID 443954

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Rekor is a software supply chain transparency log. Starting in version 0.3.0 and prior to version 1.5.2,
 the `Package.Unmarshal()` function in `pkg/types/alpine/apk.go` decompresses the signature and control
 gzip members of an APK file into in-memory buffers without bounding the total decompressed size. The
 existing `max_apk_metadata_size` check (default 1MB) is only applied to individual tar entry header sizes
 after decompression completes, so it does not prevent a decompression bomb from consuming unbounded heap
 memory. An attacker can craft a gzip stream that compresses at a ~1000:1 ratio (e.g., 2MB compressed zeros
 → 2GB decompressed). When submitted as spec.package.content in an Alpine `ProposedEntry`, the server
 decompresses the full payload into memory during request processing, triggering a fatal Go runtime out-of-
 memory error or OS OOM-kill that cannot be caught by the server's recover() middleware. This is reachable
 via two unauthenticated endpoints, `POST /api/v1/log/entries (createLogEntry)` and `POST
 /api/v1/log/entries/retrieve (searchLogQuery)`. Both invoke `V001Entry.Canonicalize()` →
 `fetchExternalEntities()` → `apk.Unmarshal(packageData)`, which performs the unbounded decompression.
 Version 1.5.2 patches the issue. There is no effective workaround. Setting `max_request_body_size` reduces
 but does not eliminate exposure due to the ~1000:1 compression ratio (a 1MB body limit still allows ~1GB
 heap allocation). Setting `max_apk_metadata_size` has no effect on this vulnerability since the check is
 applied after decompression. (CVE-2026-48702)

Solution

Update the github.com/sigstore/rekor library and its related packages to version 1.5.2 or later.

See Also

https://github.com/advisories/GHSA-47q9-m4ww-924m

Plugin Details

Severity: High

ID: 443954

Version: Revision 1.4

Type: Local

Family: SCA Checks

Published: 6/26/2026

Updated: 8/14/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.75

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-48702

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/25/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-48702

cwe: CWE-770