Critical
babl — security advisory
libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety checks by exploiting signature overwriting in freed chunks. Attackers can call babl_free() twice on the same pointer without triggering detection, as libc's malloc metadata overwrites babl's signature field upon freeing, enabling potential memory corruption and code execution.
- Products
- babl
- Affected versions
- 0.1.12-2, 0.1.14-1, 0.1.16-1, 0.1.30-1, 0.1.34-1, 0.1.38-1, 0.1.44-1, 0.1.62-1, 0.1.72-2, 0.1.72-3, 0.1.72-4, 0.1.74-1, 1:0.1.106-2, 1:0.1.106-3, 1:0.1.108-1, 1:0.1.112-1, 1:0.1.114-1, 1:0.1.114-2, 1:0.1.114-3, 1:0.1.116-1, 1:0.1.118-1, 1:0.1.118-2, 1:0.1.120-1, 1:0.1.120-2, 1:0.1.122-1, 1:0.1.124-1, 1:0.1.126-1, 1:0.1.126-2, 1:0.1.128-1, 1:0.1.88-1, 1:0.1.92-1
- Fixed versions
- Not specified
- CVEs
- CVE-2020-37239
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:52 UTC · Revision 1
Source evidence
libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety checks by exploiting signature overwriting in freed chunks. Attackers can call babl_free() twice on the same pointer without triggering detection, as libc's malloc metadata overwrites babl's signature field upon freeing, enabling potential memory corruption and code execution.
osv:UBUNTU-CVE-2020-37239
babl
Fixed versions: Not specified
babl
Fixed versions: Not specified
babl
Fixed versions: Not specified
babl
Fixed versions: Not specified
babl
Fixed versions: Not specified
babl
Fixed versions: Not specified
babl
Fixed versions: Not specified
babl
Fixed versions: Not specified
Complete source record
{
"id": "78f677b1c7911c35b9b3233d9210207871cb020b60c4616c528dd3617227f345",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-37239",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2020-37239",
"summary": "libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety checks by exploiting signature overwriting in freed chunks. Attackers can call babl_free() twice on the same pointer without triggering detection, as libc's malloc metadata overwrites babl's signature field upon freeing, enabling potential memory corruption and code execution.",
"evidence": "osv:UBUNTU-CVE-2020-37239",
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{
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},
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/6/versions"
},
{
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"evidence": "/affected/6/versions"
},
{
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},
{
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},
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{
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{
"value": "1:0.1.116-1",
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},
{
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"evidence": "/affected/7/versions"
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{
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{
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{
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{
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},
{
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}
],
"severity": "critical",
"structured": {
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"aliases": [
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],
"metrics": [
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"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
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"affected": [
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],
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"ecosystem": "Ubuntu:16.04:LTS"
},
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"0.1.14-1",
"0.1.16-1"
],
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},
"ecosystem_specific": {
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"ecosystem_specific": {
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"ecosystem_specific": {
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},
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"1:0.1.92-1"
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"ecosystem_specific": {
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"1:0.1.122-1",
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"ecosystem_specific": {
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{
"binary_name": "gir1.2-babl-0.1",
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},
{
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],
"modified": "2026-10-17T12:56:14.303918621Z",
"provider": "osv",
"upstream": [
"CVE-2020-37239"
],
"references": [
"https://ubuntu.com/security/CVE-2020-37239",
"https://www.cve.org/CVERecord?id=CVE-2020-37239",
"https://www.exploit-db.com/exploits/49259",
"https://www.gegl.org",
"https://www.gegl.org/babl/",
"https://www.vulncheck.com/advisories/libbabl-broken-double-free-detection-memory-safety"
]
},
"related_cves": [
{
"value": "CVE-2020-37239",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355003,
"published_at": "2026-05-16T16:16:00+00:00"
}